scholarly journals Transient Stability Improvement on Jos – Gombe 330kV Line Using Static Var Compensator

2019 ◽  
pp. 1-7
Author(s):  
Joseph F. Udo ◽  
Maruf A. Aminu
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Transient Stability ◽  
Reactive Power ◽  
Optimal Placement ◽  
Eastern Region ◽  
Static Var Compensator ◽  
Transmission Grid ◽  
Reactive Power Flow ◽  
The Impact

In this paper, the result of a study carried out to determine the impact of static VAr compensator on voltage profiles and reactive power flow in the Nigerian 330kV transmission grid network is presented. The research seeks to mitigate the challenge of high reactive power on Jos – Gombe 330kV single circuit transmission line. The high reactive power is produced in that axis as a result of low industrial demand in the North-Eastern region of Nigeria which results in low-inductive loading of the long transmission line that spans from Jos to Gombe and its extension to Yola, Damaturu and Maiduguri. The study also performed optimal placement of the static VAr compensator in the area where it can influence the voltage at the static VAr compensator device connection point by controlling the reactive power flow through the grid. This was accomplished by modeling the existing 330kV Nigerian network in DIgSILENT PowerFactory. The result is an improved power stability on the line between Jos and Gombe. The voltage tolerance with the approved Nigerian Grid Code and compliance was ensured. Also, the static VAr compensator was proposed over reactors due to the fact that it is dynamically switched.

scholarly journals Real and Reactive Power Control by using 48-pulse Series Connected Three-level NPC Converter for UPFC

2011 ◽  
pp. 1-5
Author(s):  
A. Naveena ◽  
M.Venkateswara Rao
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Reactive Power ◽  
System Stability ◽  
Unified Power Flow Controller ◽  
Control Mechanisms ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Flow Controller ◽  
Power Flow Controller

The equipments based on the power electronics have been improved under the name of Flexible Alternating Current Transmission Systems (FACTS) in the last years. Unified Power Flow Controller (UPFC) is the most widely used FACTS device to control the power flow and to optimize the system stability in the transmission line. UPFC is a FACTS devices that can control active and reactive power flow in transmission line by means of injection controllable series voltage to the transmission line. This paper proposes a new connection for a Unified Power Flow Controller (UPFC) to control the active and reactive power flow control in two sides of a transmission line independently and it regulates bus voltage in the same transmission line, furthermore it is possible to balance line current too. This connection of the UPFC will be called an center node UPFC (C_UPFC). It is one of the newest devices within the FACTS technology. The structure and capability of the C_UPFC is discussed and its control scheme is based on the d-q orthogonal coordinates. According to this, the performance of UPFC for several modes of operations using different control mechanisms based on Proportional-Integral (PI) and PID based controllers has been studied. The obtained simulation results from Matlab/simulink confirm the effective features.

Power Quality Enhancement Using the Interline Power Flow Controller

2015 ◽  
Vol 6 (3) ◽  
pp. 415 ◽  
Author(s):  
Ben Slimane Abdelkader ◽  
Chelleli Benachiba
Keyword(s):  
Transmission Lines ◽  
Power Flow ◽  
Reactive Power ◽  
Flexible Ac Transmission ◽  
Flexible Ac Transmission System ◽  
Reactive Power Flow ◽  
Flow Controller ◽  
Ac Transmission ◽  
The Impact ◽  
Power Flow Controller

Interline Power Flow Controller (IPFC) is one of the latest generation Flexible AC Transmission system (FACTS). It is able to control simultaneously the power flow of multiple transmission lines. This paper presents a study of the impact the IPFC on profile of voltage, real and reactive power flow in transmission line in power system. The obtained results are interesting.

Optimal Location of UPFC with ATC Calculation

2013 ◽  
Vol 313-314 ◽  
pp. 896-900 ◽  
Author(s):  
Norhafiz bin Salim
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Thermal Loading ◽  
Reactive Power ◽  
Base Case ◽  
Unified Power Flow Controller ◽  
Available Transfer Capability ◽  
Reactive Power Flow ◽  
Bus Voltage ◽  
Bus System

Flexible AC Transmission System (FACTS) devices namely Unified Power Flow Controller (UPFC) will gives a basic control for transmission line real/reactive power flow and bus voltage/shunt reactive power. UPFC helps in regulating the power and mitigating the rotor speed instability and damping oscillations. UPFC placement was conducted at each line in the entire network system to obtain the most suitable optimum location for most effectiveness performance. The performance of the optimal UPFC location is checked by applying a fault across a transmission line to which UPFC is connected and the power flow in the line and stability of the system is determined. Available Transfer Capability values indicate allowable highest magnitude of active power (MW) that can be transferred from the source to the sink over and above the already committed uses (base case) of the whole network without exceeding any line thermal loading and bus voltage limits. Finally, simulations were carried out using PSAT software to validate the performance of the UPFC which connected to a transmission line. The effectiveness for UPFC is demonstrated on IEEE 9 bus and IEEE 24 bus system while for ATC is demonstrated on IEEE 6 bus system and all the results are compared.

scholarly journals Impact of Changes in a Distribution Network Nature on the Capacitive Reactive Power Flow into the Transmission Network in Slovakia

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5321
Author(s):  
Matej Tazky ◽  
Michal Regula ◽  
Alena Otcenasova
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Power Transmission ◽  
Low Voltage ◽  
Point Of View ◽  
Electricity System ◽  
Reactive Power Flow ◽  
Main Emphasis ◽  
The Impact ◽  
Lower Voltage

The main emphasis in the operation of an electricity system is placed on its safe and reliable operation. The flow of reactive power in a network can affect voltage conditions in individual nodes of the transmission system. In recent years, there have been changes in the network that have resulted in increased capacitive reactive power flows from lower voltage levels to higher ones. These flows can cause the voltage to rise above the limit. This paper examines recent changes in the reactive power transmission in the network, especially at lower voltage levels. The possible impact of these changes on the flow of capacitive reactive power at higher voltage levels is analyzed. This paper also presents a description and the simulated impact of power lines at different voltage levels on reactive power flows. Real measurements of different types of consumers at the low-voltage (LV) level are analyzed. Finally, a simulation model was created to simulate the impact of a customer’s power contribution to the reactive power flows from the point of view of a 110 kV voltage node. This node is characterized as a supply point.

scholarly journals Allocation of distributed generation and capacitor banks in distribution system

2019 ◽  
Vol 13 (2) ◽  
pp. 437 ◽  
Author(s):  
Olatunde Oladepo ◽  
Hasimah Abdul Rahman
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
Reactive Power ◽  
Optimal Placement ◽  
Voltage Profile ◽  
Power Losses ◽  
Capacitor Banks ◽  
Reactive Power Flow ◽  
Imaginary Power

<p>Voltage profile and power losses on the distribution system is a function of real and imaginary power loading condition. This can be effectively managed through the controlled real and reactive power flow by optimal placement of capacitor banks (CB) and distributed generators (DG). This paper presents adaptive Particle Swarm Optimization (MPSO) to efficiently tackle the problem of simultaneous allocation of DG and CB in radial distribution system to revamp voltage magnitude and reduce power losses. The modification to the conventional PSO was achieved by replacing the inertial weight equation (W) in the velocity update equation base on the particle best experience in the previous iteration. The inertial weight equation is designed to vary with respect to the iteration value in the algorithm. The proposed method was investigated on IEEE 30-bus, 33-bus and 69-bus test distribution systems. The results shows a significant improvement in the rate of convergence of APSO, improved voltage profile and loss reduction.</p>

scholarly journals LOSS ALLOCATION OF TRANSMISSION LINE AND MINIMIZATION OF LOSS FOR 5 BUS,14 BUS &30 BUS SYSTEMS

2014 ◽  
pp. 150-155
Author(s):  
SUNIL KUMAR A.V. ◽  
KUMUDEESH K.C ◽  
REKHA C.M ◽  
DR.SHIVASHARANAPPAG .C
Keyword(s):  
Transmission Line ◽  
Power Flow ◽  
Transmission Loss ◽  
Load Flow ◽  
Optimal Placement ◽  
Steady State Condition ◽  
Loss Allocation ◽  
Injection Model ◽  
Sensitivity Factors ◽  
The Impact

The paper focuses on the issue of transmission loss allocation and transmission loss minimization by incorporating UPFC injection model using load flow analysis. To investigate the effect of the UPFC on the steady state condition of the system and load flow, different models can be used. These models are usually based on modification of traditional load flow methods. In this project, a mathematical model for UPFC referred as UPFC injection model is used. Since accurate power tracing is very difficult, allocation of losses for a particular transaction (in power business it is buying and selling system) may not be effectively realized. However loss allocation is an important aspect in determining the cost of transmission. Thus a methodology to find the losses accurately is vital. It is imperative to make sure that all users of the transmission network are charged proportionate to their usage and this aspect is all the more important because of the common infrastructure they use. The Z-bus loss allocation method is used to achieve the required objective. This method will promote more efficient network operations when implemented in deregulated electric industries. The Unified Power Flow Controller (UPFC) injection model is incorporated in Load Flow Model by the method of Newton Raphson Algorithm to study its effects for power flow control and losses minimization in the power system. In this project optimal placement of UPFC is conducted based on active power loss Sensitivity factors. Based on these sensitivity factors the UPFC is optimally placed in the required transmission line to investigate the impact of UPFC in the system. The changes in the system are studied to see the impact of the UPFC. The impact of UPFC are analyzed by using 5-Bus, IEEE.

Impact of faults on bus stability on an island 330kV mesh network on the Nigerian grid

2020 ◽  
Vol 2 ◽  
pp. 30-41
Author(s):  
Abel E. Airoboman ◽  
Ayemere P. Oriaifo ◽  
Samuel T. Wara
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Mesh Network ◽  
Voltage Profile ◽  
Ring Network ◽  
Reactive Power Flow ◽  
Control Centre ◽  
Radial Network ◽  
The Impact ◽  
National Control

This study carried out an assessment on the impact of faults on bus stability along the Benin-IkejaWest-Aiyede-Oshogbo-Benin (BIAOB) 330kV island network. The sensitivity of BIAOB as a ring network on the Nigerian grid aroused the interest behind its choice for this study. The network parameters were collated from the National Control Centre, Oshogbo and the network was modeled on the MATLAB 2015 environment using the obtained data. A high reactive power flow was observed in all the buses while the lowest voltage profile was observed on the Line-Line-Line-Ground (L-L-L-G) simulated in bus 1. This is an indication that symmetrical faults have the greatest impact on the network. Further results showed that the BIAOB network has a better voltage profile when compared with other radial network from existing literature. The paper concluded by recommending the closure of more radial network on the grid in order to improve its performance.

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